JPH0120697Y2 - - Google Patents

Description

[Detailed description of the invention] For example, when an abnormal current flows in a power line such as a distribution line due to a single-line ground fault, phase-to-phase short circuit, or other similar accident, the invention displays the section where the accident occurred, and An assembly structure for multiple detection and recovery cut cores used in a power line abnormal current display device that can cancel the fault display and return to normal display after a certain period of time has passed after the fault condition has been resolved and power has been retransmitted. The purpose of this is to support at least one of the two core pieces constituting each cut core so that it can be displaced relative to the connecting member, so that when a plurality of cut cores are combined,
To provide a cut core assembly structure capable of correcting incomplete contact of the cut surfaces due to production and assembly errors of the cut core, ensuring the contact of the cut surfaces, and maintaining the characteristics of the core.

Hereinafter, an embodiment in which the present invention is embodied in an assembly structure of a cut core for detection and recovery of an abnormal current display device of a power line will be explained with reference to the drawings.
is a main body case integrally molded from rubber,
A cylindrical skirt portion 1a is integrally formed at the lower part of the lower portion, and a thin wall portion 1b is formed at the intermediate outer peripheral portion of the skirt portion 1a, so that the lower half portion can be folded upward. 2 and 3 are inverted U-shaped lid cases that are removably attached to the upper surface 1c of the main body case 1 and are integrally molded with rubber, and have female threaded portions 4a on both upper sides. The mounting brackets 4 are embedded in the cases 2 and 3 so that they do not come off when the cases 2 and 3 are molded. Reference numeral 5 denotes a connecting plate in the shape of a short rectangular cylinder with a lid fitted over the upper surfaces of both lid cases 2 and 3, and a screw 6 is screwed into the female threaded portion 4a of the mounting bracket 4 from the outside of the side wall of the connecting plate. The lid cases 2 and 3 are connected to each other so that each lid case 2 and 3 can rotate slightly around a screw 6 with respect to the connecting plate 5. Note that the outer surface of the connecting plate 5 is coated with an insulating layer (not shown) made of synthetic resin or the like.

Reference numeral 7 indicates an inverted U-shaped upper core piece 8 made of a magnetic material such as soft iron that is inserted when the lid case 2 is molded, and a U-shaped upper core piece 8 that is made of a magnetic material such as soft iron that is inserted when the main body case 1 is molded. The cut core for detection is formed into an annular shape so as to surround the outside of the power line L in the assembled state with the lower core piece 9 having a shape, and is capable of detecting abnormal current generated in the power line L in the event of an accident. Reference numeral 10 denotes a first coil wound around the lower core piece 9, and together with the detection cut core 7 constitutes a detection current transformer 11.

Reference numeral 12 denotes an inverted U-shaped upper core piece 13 formed by laminating a large number of magnetic materials with high relative magnetic permeability such as silicon steel plates, which are inserted during molding of the other lid case 3, with an adhesive; The cut core for return is formed in an annular shape so as to surround the outside of the power line L in the assembled state by the U-shaped lower core piece 14 inserted during molding of the main body case 1, and the cut core for return is connected to the power line for return from the power line. I am trying to input it. Reference numeral 15 denotes a second coil wound around the lower core piece 14, which together with the cut core 12 for return constitutes a transformer 16 for return power.

The upper surface 1c of the main body case 1 is provided with a tapered annular groove 1f that becomes narrower toward the bottom along the outer edges of the four cut surfaces 9a, 14a of the lower core pieces 9, 14.
are respectively formed, and tapered annular protrusions 2a and 3a that are tightly fitted into the annular groove 1f are formed on the four lower end surfaces of the lid cases 2 and 3, respectively,
The adhesive action prevents rainwater from entering. or,
Silicone grease is applied to the annular groove 1f and the annular projections 2a, 3a to improve the corrosion resistance and watertightness of the end surfaces of the upper core pieces 8, 13 and the lower core pieces 9, 14.

17 is a head 17a when the main body case 1 is molded.
A pair of mounting bolts are inserted and fixed in an upward direction, and female threaded portions 17b are formed at the upper ends of the bolts. The lid cases 2 and 3 are tightened and fixed between the upper surface of the main body case 1 and the connecting plate 5, and the cut cores 7 and 12 for detection and return are fixed.
The cut surfaces 8a, 13a, 9a, 14a of the upper core pieces 8, 13 and the lower core pieces 9, 14 are pressed into close contact with each other. Reference numeral 19 denotes a pair of retaining plates fixed to the lower surfaces of the heads 17a of the pair of mounting bolts 17 by screws 20, respectively, and engagement recesses 19a are formed on both sides of the plates as shown in FIG. Approximately U to the engagement recess
The main body case is assembled by engaging four support members 21 made of an insulating material such as rubber formed in a letter shape, and fitting the lower portions of the lower core pieces 9 and 14 on both sides to the corresponding pair of support members 21. When molding 1, the lower core piece 9,
14 are held parallel at regular intervals.

As shown in FIG. 2, a groove 22 is formed in the center of the upper surface 1c of the main body case 1 along an engagement groove 1d having an arcuate cross section and passing through the inside of the detection and return cut cores 7, 12. The lower clamping fitting for the engaged power line L has a clamping surface 22a having an arcuate cross section formed on its upper surface, and a pair of mounting bolts 17 on both sides of the central portion as shown in FIG.
A locking piece 22c provided with a hole 22b through which the
are integrally formed. Reference numeral 23 denotes a thick upper clamp fitting having almost the same shape as the lower clamp fitting 22, and clamping surfaces 23a and 23b having different radii of curvature are formed on the upper and lower surfaces thereof.
As shown in FIG. 7, on both sides of the central portion, there is a hole 23c into which one of the mounting bolts 17 can be loosely inserted, and a notch 2 into which the other mounting bolt 17 can be fitted from the side.
A locking piece 23e provided with 3d is integrally formed, and the upper and lower surfaces of the locking piece 23e on the side of the notch 23d prevent the washer 24 fitted to the mounting bolt 17 from moving in the horizontal direction. Locking protrusion 23f
is formed. Then, when the power line L is inserted between the clamp surfaces 23b and 22a of the upper and lower clamp fittings 23 and 22 that constitute the clamp mechanism, and the upper clamp fitting 23 is pressed downward by the nut 25 screwed into the mounting bolt 17, the power line L is inserted. L
is adapted to be held between both clamp fittings 22 and 23.

26 is a mounting frame that is removably housed in the skirt portion 1a of the main body case 1 as shown in FIG. a display drive unit which is operated by the display drive unit; a return drive unit which is operated by the steady current introduced by the return cut core 12; and a return drive unit which is operated by the display drive unit and which is operated by the return drive unit. A display mechanism section that is released and returned to a steady state from a display state is integrally assembled, and the display section of the display mechanism section can be visually viewed from the lower end opening of the skirt section 1a.

Next, the operation of the abnormal current display device configured as described above will be explained.

If an accident occurs in the power line L and an abnormal current flows, an output voltage of a certain value or more will be generated on the output side of the detection current transformer 11, which will cause the display drive section (not shown) to operate, and the display mechanism will cause the fault to occur. Display is performed.

Next, the switch or breaker installed in the power line L stops the abnormal current, and after the power line goes into a no-power state for a while, it returns to the normal state and starts flowing a steady current, and then the power is restored. A current from the transformer 16 is supplied to the return drive section, and the display mechanism section is gradually operated to return.

After the power is retransmitted, after a certain period of time (approximately 3 hours) required for a patrol to investigate the cause of the accident, the display mechanism is returned to its normal position.

Now, in the embodiment of the present invention, the lid cases 2 and 3 are formed by insert molding the upper core pieces 8 and 13.
The mounting brackets 4 are embedded and fixed on both sides of the upper part of the case, and each case 2, 3 is rotatably supported by the screw 6 against the side wall of the connecting plate 5. When screwing together and pressing the connecting plate 5 toward the upper surface 1c of the main body case 1, and pressing the upper core pieces 8, 13 against the lower core pieces 9, 14 inserted into the main body case 1, each core Cut surfaces 8a, 13a, 9 of pieces 8, 13, 9, 14
Even if there is a manufacturing error in a, 14a or an assembly error in the core pieces, the upper core pieces 8, 13 will rotate around the screw 6, and the cut surfaces 8a, 13a will cut the lower core pieces 9, 14. It is possible to reliably contact the entire surfaces 9a and 14a to maintain the characteristics of the cores 7 and 12 in a good state, and as a result, abnormal current detection and display and recovery operations can be performed reliably.

Furthermore, in the embodiment of the present invention, the main body case 1 and the lid cases 2 and 3 are each molded from an elastic material such as rubber, so the lower core pieces 9 and 14 can be independently displaced in any direction on the main body case 1 side. , the upper core pieces 8, 13 can also be displaced in any direction independently with respect to the connecting plate 5, so that the cut surfaces 8a, 1 of each core piece
3a, 9a, and 14a can be brought into contact accurately and reliably.

Moreover, the present invention can also be embodied in the following embodiments.

(1) In the above embodiment, the upper core pieces 8 and 13 are made rotatable, but the lower core pieces 9 and 14 are also rotatably supported with respect to the main case 1, or only the lower core pieces 9 and 14 sides are supported rotatably. To be rotatably supported.

(2) The screws 6 and mounting brackets 4 that rotatably support the lid cases 2 and 3 are omitted, and the upper surfaces of the cases 2 and 3 are bonded to the lower surface of the connecting plate 5 with adhesive.

(3) In addition to power line abnormal current display devices, the present invention shall be implemented in various electrical devices that use multiple cut cores.

In this way, the present invention provides a pair of connections that connects a plurality of core pieces located on one side of a plurality of cut cores and a plurality of core pieces located on the other side corresponding to the core pieces. At least one core piece of each cut core is displaceably attached to the member, and the pair of connecting members are tightened and fixed to each other by a tightening member, so that manufacturing errors occur on the cut surface of the core. In addition, even if there is an assembly error in the cut core, it is possible to absorb the error and ensure that the corresponding cut surfaces are brought into contact with each other, thereby maintaining the characteristics of the cut core in an appropriate state.

[Brief explanation of the drawing]

FIG. 1 is a half-longitudinal cross-sectional view showing an embodiment of the present invention as an abnormal current display device for a power line, FIG. 2 is an enlarged half-longitudinal cross-sectional view of the vicinity of the cut core, and FIG.
4 is a plan view of the main body case, and FIG. 5 is a perspective view of the lid case viewed from below.
Figure 6 is a perspective view showing the holding plate of the cut core;
The figure is a perspective view of the upper and lower clamp fittings. 1... Main body case, 2, 3... Lid case, 4
...Mounting bracket, 5...Connection plate, 6...Screw, 7...
...Cut core for detection, 12...Cut core for return, 17...Mounting bolt, 18...Screw, 22,
23...Lower (upper) clamp fitting.

Claims (1)

[Claims for Utility Model Registration] 1. A pair that connects a plurality of core pieces located on one side of a plurality of cut cores and a plurality of core pieces located on the other side corresponding to the core pieces. A cut core assembly structure characterized in that at least one core piece of each cut core is displaceably attached to the connecting member, and the pair of connecting members are tightened and fixed to each other by a tightening member. . 2. The cut core assembly structure according to claim 1, wherein the core piece of the cut core is displaceably attached to the connecting member via an elastic material such as rubber. 3. The core piece of the cut core is supported so as to be rotatable in the direction in which the distance between adjacent core pieces changes with respect to the connecting member.Claim 1 of Utility Model Registration
Assembling structure of cut core as described in section.